But they haven't gone for enough, IMO. Saying 'make the game your own' isn't stopping people from saying, this race represents 'xyz' and that insults me, you must change it!
They have to be clear that no assumptions have been made and give people the tools to change things.
They need to codify ways to homebrew and change things. The DMG does this a bit with some of the expanded rules.. They need to go into more details of how to create and balance feats, tweak and invent races.
It's just not obvious for a lot of people.